#6 & #13 are the same (Glee: The Music - The Christmas Album). Also #8 & #16(Glee, The Music: Season Two, Volume 4). Also #11 & #39 (Glee, The Music
Presents: The Warblers). Also #14 & #15 (Glee, The Music: Season Two: Volume
6). Also #12 & #17 (Glee: The Music - The Christmas Album - Volume 2). (Looks
like it re-entered the Billboard charts a year later). Also #18 & #41 (Glee:
The Music: Season 3 - Volume 7). And finally #5 (Glee: The Music - Season One
- Volume 1) - The Chart entry of UK 41 - 12 weeks should be removed &
transferred to a separate album (Glee: The Music - Best Of Season One). This
would then allow you to transfer #9 to #5.

We think we've managed all those, thanks

20 Dec 2016

Missing Billboard Data

All (15) of these albums made the Billboard charts (also possibly a few more).They are probably listed under 'Television Soundtracks' rather than 'Glee
Cast'.